Coil excited vibrator assemblage



April 26, 1966 F. E. SMITH 3,248,580

COIL EXCITED VIBRATOR ASSEMBLAGE Filed Jan. 11, 1963 2 ee s-S l Q "I TII' T T ii s .16 7 IN VENTOR.

Joya 5.6112551 BY April 26, 1966 F. E. SMITH 3,

COIL EXCITED VIBRATOR ASSEMBLAGE Fil ed Jan. 11, 1963 2 Sheets-Sheet 2INVENTOR.

United States Patent 3,248,580 COIL EXCITED VIBRATOR ASSEMBLAGE Floyd E.Smith, 3430 Glenside Ave., Erie, Pa.

. lh'led Jan. 11, 1963, Ser. No. 250,835

14 Claims. (Cl. 31028) This invention relates to a vibrator assemblageof the electromagnetic type for use in vibrating objects as required invarious processing operations.

Under certain operating conditions, it is desired to have high intensityvibrations, even though available vibrator space is limited.Accordingly, it is an object of the invention to provide anelectro-magnetic type vibrator wherein high intensity vibrations areattainable with a relatively small and compact vibrator assemblage. Suchan object is realized by. arranging a major portion of the vibratormass, as the vibrating body. More particularly, the lamination stack,coil and a relatively heavy cover plate for the stack, are included inthe vibratory mass portion of the vibrator. The weight ratiopercentage-wise of said vibratory elements and the overall weight of thevibrator assemblage, is preferably above 50%.

Among other features desirable in a vibrator of the type underconsideration, is a provision for adjusting the vibration intensitywithin a given range. While such adjustment can be made with an inputpower regulator, such as a rheostat, a built-in intensity adjustmentmeans enhances the commercial attractiveness of a vibrator. Accordingly,a further object of the invention is the provision of a simple means foradjusting the intensity of vibrations in a rapid and convenient manner.Toward this end, a pair of adjusting screws are provided which may beused to accomplish such adjustment, without the need for disassembly ofthe vibrator and while it is in a given operative position. Veryaccurate adjustment is thus attainable. the need for factory adjustment,which makes for a custom-built type of manufacturing operation insofaras customer specifications vary according to contemplated usage, oroperative limits.

A further feature desired in a vibrator of the subject type, is theprotection of the working parts against dust or dirt. Hence, anotherobject is the provision of means for insuring that the interior of thevibrator will be completely sealed against contamination by dust, dirt,or other deleterious substances. A totally enclosing cover is providedfor attainment of such an object, which cover may be readily applied,and/ or removed as the case may be.

Further objects are to provide an electromagnetic type of vibrator whichis of simple design, of rugged construction, and which will provide longand trouble-free service.

These and further objects and features of the invention will become moreapparent from the following description and accompanying drawingswherein:

FIG. 1 is an exploded perspective-like view of a vibrator assemblageillustrative of an embodiment of the invention;

FIG. 2 is an enlarged vertical section view of the vibrator assemblageof FIG. 1;

FIG. 3 is a section view, on a reduced scale, as seen from line 33 inFIG. 2;

FIG. 4 is a plan view of a base plate used in the vibrator assemblage ofFIG. 1;

FIG. 5 is an edge view of same;

FIG. 6 is a plan view of an armature used in the vibrator assemblage ofFIG. 1; FIG. 7 is an edge view of same;

r 3,248,580 Patented Apr, 26, 1966 ice , 2 to indicate a vibrator sizewhich has had successful com; mercial application.

Referring now to the drawings, numeral 10 identifies a vibratorassemblage embodying the principles of the invention, which includes abase plate 12, an armature 14, a plurality of post assemblies eachformed of a rubber spring 16 and a spacer 18, a core and coil assembly20 aflixed to a top plate 22, and a cover 24.

v The base plate 12 is of generally rectangular shape, and is formedwith two circular recesses 26, on the upper surface of the plate whichare symmetrically arranged relative to the midpoint thereof, as bestseen in FIG. 4. A pair of holes 28 are formed in the plate 12, each ofthe holes coinciding with the center of a respective recess 26, andhaving a counter bore 30 at the lower end, where by a recessed head, capscrew 32 may be arranged for threaded engagement with holes 33, formedin the armature 14. The armature which has an elongated rectangularshape, is positionally supported upon the base plate 12 by a pair ofrubber 0 rings 34, each being seated in a recess 26. The major diameterof each ring 34, is preferably equivalent to the diameter of its seatingrecess 26.

Such adjustment means also eliminates FIG. 8 is a plan view of acompression ring used in i the vibrator assemblage of FIG. 1; and

FIG. 9 is a vertical section view of a rubber spring of a post assemblyused in the vibrator assemblage of FIG. 1. FIGS. 3 to 8 inclusive havebeen drawn in full scale By rotating the cap screws 24, the armature 14may be positioned a variable distance relative to the base plate 12, forreason of which will become more apparent hereinafter. A post mountingmeans in the form of a threaded hole 36 is provided in the geometricalcenter of the base plate 12, for receipt of a post, or rod 38, wherebythe vibrator 10 may be mounted upon an object, or surface (not shown) tobe vibrated. The post is long enough to provide clearance for a wrenchso that the screws may be rotated as required in an adjusting operation.Four threaded holes 40 are symmetrically arranged in the base plate 12for receipt of the rubber springs 16. As best seen-in FIG. 3, the rubbersprings 16 are positioned to provide ample clearance for the armature14. Threaded holes 42 are formed in opposite sides of the base plate 12for receipt of screws 44 which pass through holes 46 1n the cover 24whereby the latter may be removably atfixed to the base plate.

. The core and coilassembly 20 includes a plurality of E-shapedlaminations 48, forming a lamination stack which is secured, such as bywelding, to an assembly plate 50, and a coil 52. The lamination stack issubstantially equal in width to the width of the armature 14. The coilis wound with wire as required for attainment of desired operation orperformance characteristics, as is well within the knowledge ofelectrical engineers, and others skilled in the art. For example, oneoperative model designed for volt, 60 cycle operation, at 10 watts, had3,000 turns of No. 35 wire. The assembly plate 50 is sandwiched betweenthe top plate 22 and the spacers 18, and secured to the spacers byfastening means such as recessed head cap screws 54, passing throughrecessed holes 56 formed in the top plate. A grommet 58, positioned in ahole formed in a side wall of the cover 24, provides an insulatedoutletfor lead wires (not shown) connected to the coil 52.

The rubber spring 16 used in each of the post assemblies is formed' of arubber cylindrical piece 60 having a fiat headed stud 62 bonded to eachend, as best seen in FIG. 9. I

A magnetic flux path is formed by the laminations 48 and the armature14, which path includes anadjustable gap 64 disposed between the end ofthe laminations and the upper surface of the armature. Adjustment of thegap dimension 64 by means of the screws 32, will vary the vibrationamplitude to a degree as desired within the operative range of thevibrator. It will be seen that the rubber 0 rings 34 will resilientlysupport the armature A 14 in-adjusted position so that the position ofadjustment will be maintained. Amplitude adjustment may thus be madewith the vibrator operatively mounted upon the object to be vibrated,which provides great convenience for final adjustment at point of use.

The materials required in the formation of various parts of the vibratorassemblage 10, may vary according to design specifications. By way ofexample, the armature 14 may be of Armco ingot iron, the base plate 12and top plate 22 of cold rolled steel, the laminations of Webcor W-SOsteel, the spacers 18 of hex. brass, the rings 34 of BunaN rubber, therubber springs 16 as in Lord shock mountings, and the cover 24 beingmade of aluminum. For sixty cycle operation, the rubber springs 16preferably have a Durometer rating of about 65; for lower frequencyoperation, a softer rubber may be desirable, such as a Durometer ratingof 50, at fifty cycle current.

Since the size of the major vibratory parts are important for attainmentof the stated objectives, it has been found that a top plate 22 havingdimensions of approximately 1 square by /8" thick, and a laminationstack having overall dimensions of 1%" x 1 x /8", and a wire coil ashereinbefore specified, will provide a high magnitude vibratory outputcoupled with small vibrator size. As will be readily apparent, the massof the lamination and coil assembly 20, as well as the relatively heavycover plate 22, and the post assembly spacers 18 all of which form atleast fifty percent of the total weight of the vibrator 10, will beapplied in an alternating manner to the base plate 12 via the postassemblies, so that a vibratory force of great magnitude will begenerated with a comparatively small size vibrator assemblage. Note thatthe armature adjustment means, i.e.,, screws 32, allows greaterdimentional tolerances of certain parts, because final adjustment may bemade on the vibrator after assembly, and in operative position ifdesired, to provide optimum operation thereof.

It will be seen that a vibrator assemblage made as above described willsatisfy all of the objectives set forth hereinbefore.

The foregoing description has been given in detail without thought oflimitation since the inventive principles involved are capable ofassuming other forms without departing from the spirit of the inventionor the 'scope of the following claims.

What is claimed is:

1. A vibrator assemblage comprising in combination, a base plate, anarmature, a pair of rubber rings compressively disposed between thearmature and base plate, a lamination stack secured to a top plate, acoil arranged on the lamination stack, a plurality of post assembliesfor mounting the top plate to the base plate with an air gap between theend of the lamination stack and the armature, and means to adjust theposition of the armature relative to the base plate.

2. A vibrator assemblage comprising in combination, a base plate, anarmature, a pair of resilient rings arranged for compressive mountingbetween the armature and the base plate, a lamination stack secured to-a top plate, a coil arranged on the laminations, a plurality of postas, semblies for mounting the top plate to the base plate with an airgap between the end of the lamination stack and the armature, said postassemblies each including a resilient section, and a pair of adjustingscrews seated in the base plate and threadably engaging the armaturewhereby the armature may be adjustably positioned relative to the baseplate.

3. A vibrator assemblage according to claim 2, wherein a cover isadapted to enclose the elements of the assemblage.

4. A vibrator assemblage according to claim 2, wherein the resilientrings are formed of rubber.

5. A vibrator assemblage according to claim 4, wherein the post assemblyresilient section is formed of rubber.

6. A vibrator assemblage comprising in combination, a generallyrectangular base plate, an elongated rectangular armature, a pair ofrubber rings disposed between the 4 armature and the base plate andsymmetrically arrange relative to the armature, a lamination stacksecured to a top plate, a coil arranged on the laminations, a pluralityof post assemblies one each being positioned in a corner region of thebase plate and connecting the cover plate to the base plate with an airgap between the end of the lamination .stack and the armature, and apair of adjusting screws seated in the base plate, and rotatable fromthe exterior surface of the base plate, said screws each extendingthrough a respective rubber ring and threadably engaging the armature.

7. A vibrator assemblage according to claim 6, including a cover whichis removably affixed to the base plate and is arranged to enclose theother elements of the vibrator assemblage.

8. A vibrator assemblage according to claim 6, wherein each of the postassemblies includes a cylindrical rubber portion.

9. A vibrator assemblage according to claim 6, wherein the base plate isformed to provide recesses for seating the rubber rings.

10. A vibrator assemblage according to claim 6, wherein a post mountingmeans is provided in the geometrical center of the base plate.

11. A vibrator assemblage according to claim 6, wherein a post mountingmeans comprises a threaded hole.

12. A vibrator assemblage comprising in combination, a base plate, anarmature, resilient means compressively disposed betwen the armature andbase plate, a lamination stack secured to a top plate, a coil arrangedon the lamination stack, a plurality of post assemblies for mounting thetop plate to the base plate with an air gap between the lamination stackand the armature, and means to adjust the position of the armaturerelative to the base plate, said lamination stack and coil assemblyforming at least fifty percent of the total weight of the vibratorassemblage.

13. A vibrator assemblage comprising, in combination: a base plate;resilient means; an armature fixedly and adjustably secured to said baseplate with said resilient means compressively disposed therebetween; alamination stack and coil assembly resiliently mounted upon the baseplate so as to impart a vibratory action to said assemblage, said stackbeing spaced from said armature to form an air gap therebetween and saidarmature being positionably adjustable to vary the air gap between saidstack and said armature to vary the intensity of the vibratory actionimparted to said assemblage by said lamination stack and coil assembly.

14. A vibrator assemblage comprising, in combination: a base plate;resilient means; an armature; adjusting means for fixedly and adjustablysecuring said armature to said base plate with said resilient meanscompressively disposed therebetween; a lamination stack and coilassembly resiliently mounted upon the base plate so as to impart avibratory action to said assemblage, said stack being spaced from saidarmature to form an air gap therebetween and said adjusting means beingoperable to positionably adjust said armature to vary the air gapbetween said stack and said armature to vary the intensity of thevibratory action imparted to said assemblage by said lamination stackand coil assembly.

References Cited by the Examiner UNITED STATES PATENTS 1,684,260 9/1928Brown et al. 310250 X 1,966,446 7/ 1934 Hayes 318118 2,170,206 8/1939Mason 310-26 X 2,278,3 65 3/1942 Daniels 31029 2,753,529 7/1956 Maron etal 310-26 2,806,235 9/1957 Carstairs et al. 31029 2,852,021 9/1958Jessup.

ORIS L. RADER, Primary Examiner.

MILTON O. HIRSHFIELD, Examiner.

1. A VIBRATOR ASSEMBLAGE COMPRISING IN COMBINATION, A BASE PLATE, AN ARMATURE, A PAIR OF RUBBER RINGS COMPRESSIVELY DISPOSED BETWEN THE ARMATURE AND BASE PLATE, A LAMINATION STACK SECURED TO A TOP PLATE, A COIL ARRANGED ON THE LAMINATION STACK, A PLURALITY OF POST ASSEMBLIES FOR MOUNTING THE TOP PLATE OF THE BASE PLATE WITH AN AIR GAP BETWEEN THE END OF THE LAMINATION STACK AND THE ARMATURE, AND MEANS TO ADJUST THE POSITION OF THE ARMATURE RELATIVE TO THE BASE PLATE. 